• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 심포지엄 논문집 정보 및 제어부문
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• pp.64-66
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• 2007

In this paper, a digital inclinometer to measure the angle and acceleration signals of subject laid on Roll was designed. The designed system consists of a tilt sensor, biaxial accelerometer, microcontroller and BlueTooth module. The designed digital inclinometer was easy to handle and easy to wear. To evaluate the performance of the system, we measured simultaneously the angle and acceleration signals from the 3 subjects on the Roll with two instruments which are ZEBRIS and our system. The measured signals were processed by statistical method and then the correlation coefficient of 0.93 was shown. From the results, the designed digital inclinometer is shown to be useful in assessment of body movement.

• The Journal of Korean Physical Therapy
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• 제25권4호
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• pp.210-216
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• 2013

Purpose: A cost effective tool for the clinical measurement of trunk reposition sense is clearly needed. This study was to analyze intrarater and interrater Reliability of trunk repositioning error (TRE) test which assesses trunk position sense using a portable digital inclinometer. Methods: Twenty four normal healthy subjects were recruited. TRE was measured using a portable digital inclinometer. A digital inclinometer (Acumar-ACU360; Lafayetter Instrument) with precision to $1^{\circ}$ was placed on skin over the spinous process from first to second thoracic vertebra (T1-T2) and secured with double-sided tape. TRE test during sitting forward and lateral flexion movement was assessed. When they reached a point approximately 50% of full trunk flexion range, the examiner instructed the subjects to stop and told them. This was the target position that they should try to reproduce exactly. Each subject performed six trials. Results: ICC (2,1) for intrarater reliability (with-day and between-day) of TRE test in sagittal and frontal plane of movement was 0.75 and 0.78 (excellent reliability). Interrater reliability was 0.66 in sagittal and 0.64, frontal plane (fair to good reliability). However, there were poor correlations between an average of TRE test in sagittal and frontal plane. Conclusion: TRE test using a portable digital inclinometer demonstrated good to excellent reliability. The device may be a cost effective clinical measurement for trunk reposition sense measurement.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년 학술대회 논문집 정보 및 제어부문
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• pp.238-240
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• 2006

In this study, we designed a digital inclinometer to measure the angle and acceleration signals. Digital inclinometer consists of a tilt sensor, accelerometer, one-chip micro controller and BlueTooth module. Using the developed system, we made an experiment with Roll. The subject is laid on the Roll and rises each foot $90^{\circ}$ and $45^{\circ}$ up, and measures angle and acceleration signals with 100Hz sampling frequency. Through several tests, we could find the possibilities and usefulness which can evaluate normality / abnormality of body posture objectively.

• 전자공학회논문지SC
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• 제45권1호
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• pp.50-56
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• 2008

본 논문에서는 롤(Roll)에 누워 있는 피검자의 각도와 가속도 신호를 측정하기 위한 디지털 경사계 설계하였다. 개발된 시스템은 기울기 센서(tilt sensor), 2축 가속도 센서(biaxial accelerometer), 마이크로프로세서(single chip microprocessor)와 블루투스(BlueTooth module)로 구성된다. 개발된 디지털 시스템은 다루기 쉽고 쉽게 착용 할 수 있다. 시스템을 성능을 평가하기 위해서 Roll위의 3명의 피검자로부터 각도와 가속도 신호는 ZEBRIS와 디지털 경사계에 의해서 동기화하여 측정하였다. 측정된 신호는 정량적인 방법에 의해서 처리되며 그때의 상관계수가 0.93임을 보여 준다. 이와 같은 결과로부터 디지털 경사계는 몸의 움직임을 평가하는데 유용할 것으로 보여 진다.

• 한국추진공학회지
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• 제15권1호
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• pp.76-82
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• 2011

우주발사체의 추력 축 정렬이 제대로 안되면 발사체의 자세제어가 불안정해지고 심할 경우 임무 실패를 초래 할 수 있으므로 추력 축 정렬은 매우 중요하다. 일반적으로 추력 축 정렬은 데오돌라이트나레이져 트렉커와 같은 광학 방식을 사용하거나 턴테이블을 사용하는 기계식 방식을 사용한다. 본 연구에는 중력 방향과 관련된 경사도계를 이용하는 쉬운 방법을 다룬다. 경사도계는 지구 중력방향과 수직이 되면 0도를 가리킨다. 이 방법은 두 개의 경사도계가 필요한데, 하나는 기준이고 다른 하나는 정렬용이다. 두 경사도계의 각도차이는 TVC 구동기를 조정하는 참고치가 된다.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2005년도 춘계학술대회 논문집
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• pp.537-540
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• 2005

The attitude control, sensors and camera installed on the spacecraft should be located according to the system alignment requirement. The alignment measurement requirement accuracy for the sensors should be below $\pm$0.1. Therefore, Alignment Measurement System which is combined theodolite, Rotating table and digital inclinometer etc., should be used. As the measurement accuracy is required very precise, the appropriate measurement procedure and alignment angle measurement, calculation and shimming work should is accomplished. Consequently, this paper is accomplished the works to align the measurement requirement accuracy throughout alignment measurement and shimming work of installed module and sensor

• 한국전문물리치료학회지
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• 제2권2호
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• pp.46-55
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• 1995

The purpose of this study was to assess the concurrent validity and reliability of goniometric measurement of joint motion. Subjects were 40 healthy university students. Measurements were performed by 4 inexperienced physical therapy students. Four different instruments were used and three readings were taken with each instrument in random order making a total of 12 readings for flexion of the right elbow of each subject. Goniometers used were 1. universal 2. fluid-based goniometer/inclinometer 3. digital LCD goniometer 4. electronic goniometer/torsiometer. The results were as follows: Concurrent validity was highest (r= .94) with the universal and digital LCD tools. Interrater reliability (Pearson Product Moment Correlation) was good for each tool. Interrater reliability calculated by ICC(2,1) was highest (.96) with the tensiometer and lowest (.78) with the digital LCD goniometer. Intrarater reliability calculated by ICC was excellent (${\geq}.90$) for all instruments. These results show that concurrent validity, intrarater and interrater reliability are very good in the used of all four types of goniometers/inclinometer/tensiometer, even with inexperienced raters. These results confirm the almost universal reliance on hand held goniometers for joint measurement by physical therapists as being a reliable practice. Further research should be done clinically with actual patients.

• 제어로봇시스템학회논문지
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• 제17권2호
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• pp.157-163
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• 2011

This paper proposes a hybrid image stabilizing system which uses both optical image stabilizing system based on EKF (Extended Kalman Filter) and digital image stabilization based on SURF (Speeded Up Robust Feature). Though image information is one of the most efficient data for object recognition, it is susceptible to noise which results from internal vibration as well as external factors. The blurred image obtained by the camera mounted on a robot makes it difficult for the robot to recognize its environment. The proposed system estimates shaking angle through EKF based on the information from inclinometer and gyro sensor to stabilize the image. In addition, extracting the feature points around rotation axis using SURF which is robust to change in scale or rotation enhances processing speed by removing unnecessary operations using Hessian matrix. The experimental results using the proposed hybrid system shows its effectiveness in extended frequency range.

• 한국항공우주학회지
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• 제32권7호
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• pp.98-104
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• 2004

위성체 얼라인먼트 측정은 측정 정밀도가 ${\pm}0.5^{\circ}$ 이하로 매우 정밀한 것이다. 일반적으로 이러한 측정은 3대 이상의 데오드라이트를 사용하여 측정되고 있다. 그러나 위성체의 위치 안정성 등에 의해 측정 정밀도 오차가 발생될 수 있다. 이에 따라, 데오드라이트, 회전 테이블 및 전자식 수평계 등을 조합하여 새로운 얼라인먼트 측정 시스템을 개발하게 되었다. 본 논문에서 이러한 측정 시스템의 개념과 측정 방법을 기술하였고, 기존의 측정 방법보다 더 좋은 정밀도를 얻을 수 있음을 알 수 있다.

• The Journal of Korean Physical Therapy
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• 제34권5호
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• pp.255-266
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• 2022

Purpose: This study sought to study the effects of cross-legged sitting posture on joint motion. It also examined the correlation between the changes in the joint range of motion, musculoskeletal symptoms, and facial asymmetry. Methods: The Acumar Digital Inclinometer (Lafayette Instrument Company, USA) was used to measure the range of motion (ROM). We measured the flexion and extension of the cervical, thoracic, and lumbar spine using a dual inclinometer, and measured the ROM of the shoulder and hip joint with a single inclinometer. The Likert scale questionnaire was used to investigate musculoskeletal symptoms and facial asymmetry. Results: The data analysis was performed using the Jamovi version 1.6.23 statistical software. After confirming the normality of the ROM with descriptive statistics, it was compared with the normal ROM through a one-sample t-test. Correlation matrix analysis was performed to confirm the association between facial asymmetry and musculoskeletal symptoms. The result of the one-sample t-test showed a significant increase in the thoracic spine extension and right and left hip external rotation (p<0.001^***), while most other joints were restricted. As per the frequency analysis, facial asymmetry was found to be 81.70%. Conclusion: The independent variable, namely cross-legged sitting posture led to an increase in ROM. The study also suggests that facial asymmetry and musculoskeletal symptoms could occur. Therefore, to prevent the increase and limitation of ROM and to prevent the occurrence of facial asymmetry and musculoskeletal symptoms, it is suggested that the usual cross-legged sitting posture should be avoided.